Initial high-temperature and high-voltage excitation test of dipole emission transducers based on bending vibration

The laminated dipole emission transducer with bending vibration for acoustic logging serves as a core component of conventional dipole logging tools. Its radiation performance and stability under high-temperature and high-pressure conditions directly determine the quality of acoustic logging data. To meet the requirements of ultra-deep well exploration, multi-cycle high-temperature (230 ℃) oil bath testing, combined with high-voltage (1 800 V) excitation, was conducted to monitor the acoustic impedance characteristics of the transducer assembly in real time. Results indicate that transducers fabricated with commercial high-temperature piezoelectric ceramic materials and stringent manufacturing processes exhibit no debonding or fracture throughout four rounds of extreme testing. The resonant frequency shows a low-frequency shift (<5%), while the maximum electrical conductance decreases significantly (85–95% reduction in X/Y directions). Static capacitance increases reversibly with temperature, and the mechanical quality factor remains stable (<10% fluctuation). Parameter variations are consistent in the X and Y directions, with differences within acceptable engineering tolerances. This study provides critical data support for the development of high-temperature acoustic logging tools, dipole remote detection systems, and push-type long-duration operation equipment, while also verifying the reliability limits of materials and processes under extreme 230 ℃ conditions.